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RISS 인기검색어
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- 저자 : 황용하 (검색결과 173 건)
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黃龍夏 충주대학교 1983 한국교통대학교 논문집 Vol.16 No.1
Ability of Diesel Engine exert strong influence on the injecting fuel temperature. And the injecting fuel temperature have on effect from the injector temperature. In the present thesis, the concideration was conducted about the effect of injector temperarure on the several important working condition. When the Engine speed and output increase, the injector temperature rised. But it decrease over some critical temperature. Therfore, can point out as follows, when the injector temperature become over the critical temperature, injection condition became worse, and Ability of Engine was dropped.
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WIRE SCREEN을 이용한 공기 가열기의 열적성능에 관한 고찰.
黃龍夏 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-
This study describes the design of a wire screen air heater. The performance of the air heater has been tasted under constant flow conditions on two days by on interval of 25 day. The efficiency is seen to be reduced to an average of 39% from an interval value of about 27%.
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공기를 이용한 태양열 집열기의 설계를 위한 이론적 연구
黃龍夏 충주대학교 1994 한국교통대학교 논문집 Vol.29 No.1
A theoretical study is conducted for the design of solar sir heaters using porous material. Rediative characteristics of glazing and porous absorbing media are found through spectral transmittances measured by the Visible spectrometer and the FT-IR. Using those characteristics the efficiencies of collectors are calculated one-dimensionally with the use of the Two-Flux radiation model. The efficiencies increase, as the air fiow rates or albedos in the visible range increase, and as albedos in the IR range decrease.
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황용하 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.4
The results of a detailed optical analyzsis of parabolic solar collectors are summarized by a few universal graphs fits.
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黃龍夏 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.1
A theoretical and experimental study was conducted in order to design of solar air heaters using porous material. On the basis of the theoretical study, a volumetric solar collector was designed, constructed and experimented. Raditaive characteristics of glazing material and porpous absorbing media were found through spectral transmittances measured by the UV-Visible and the FT-IR spectrometers. Using those characteristics the efficiencies of collectors were calculated one-dimen-sionlly with the use of the two -flux radiation model. Based on the theoretical anaysis and results, and experimental soiar collector was designed and constructed. Experimental results under various conditions show that the accummulative efficiencies are 60% in general and agree with the theoretically calculated ones.
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黃龍夏 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.1
A theoretical study is conducted for the design of solar air heaters using porous material. Using those characteristics the efficiencies of collectors are calculated one-dimensionally with the use of the Two-Flux radiation model. The efficiencies increase, as the air flow rates or albedos in the visible range increase, and as albedos in the IR range decrease.
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황용하 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
This study was measured the transmittance with various wavelength using UV-visible spectrophotometer(Shimadzu, UV-240) and FT-IR spectrometer(MIDAC) for double glass window and porous absorbing media. Refractive index of glass are obtained by the comparison of the measured transmittances and the correlations derived from the electromagnetic theory and are compared to the theoretical ones calculated from the classical dispersion theory. The transmittance of the porous absorbing media was measured with copper wire screens. And absorption and back-scattering coefficients of the porous absorbing media are also calculated the transmittances from the two-flux model theory.
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황용하,임성빈 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.4
The first maximum point in the stability curve of liquid jet, ie, the critical point is associated with the critical Reynolds number. This critical Reynolds number should be predicted by simple means. In this work, the critical Reynolds number in the stability curve of liquid jet are predicted using the empirical correlations and the experimental data reported in the literatures. The critical Reynolds number was found to be a function of the Ohnesorge number, nozzle length-to-diameter ratio, ambient Weber number and nozzle inlet type. An empirical correlation for the critical Reynolds number as a function of the Ohnesorge number and nozzle length-to-diameter ratio is newly proposed here. Although an empirical correlation proposed in this work may not be universal because of excluiding the effects of ambient pressure and nozle inlet type, it has resonably agrees with the measured critical Reynolds number.
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黃龍夏 忠州大學校 1986 한국교통대학교 논문집 Vol.19 No.2
The purpose of this paper is to describe the technology on which existing adsorption cooling systems are based. Low temperature operation of the system becomes possible if the drier can be regenerated isothermally. It will also be show that closed cycle absorption cooling system represents a practical solar cooling alternative with has the additional capability of thermal storage or heat pumping. In both alternatives the need for proper application criteria and control strategy is emphasized.
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